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A static code analysis tool with a focus on code consistency and teaching.
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Files
lib/credo/check/readability/no_parentheses_when_zero_arity.ex
defmodule Credo.Check.Readability.NoParenthesesWhenZeroArity do
@moduledoc """
Do not write parentheses when function receives no arguments
"""
@explanation [check: @moduledoc]
@def_ops [:def, :defp, :defmacro, :defmacrop]
use Credo.Check, base_priority: :low
def run(%SourceFile{} = source_file, params \\ []) do
issue_meta = IssueMeta.for(source_file, params)
Credo.Code.prewalk(source_file, &traverse(&1, &2, issue_meta))
end
for op <- @def_ops do
# catch variables named e.g. `defp`
defp traverse({unquote(op), _, body} = ast, issues, issue_meta) do
function_head = body |> Enum.at(0)
{ast, issues_for_definition(function_head, issues, issue_meta)}
end
end
defp traverse(ast, issues, _issue_meta) do
{ast, issues}
end
defp issues_for_definition({_, _, args}, issues, _) when length(args) > 0 do
issues
end
defp issues_for_definition({name, meta, _}, issues, issue_meta) do
line_no = meta[:line]
source_file = IssueMeta.source_file(issue_meta)
line = SourceFile.line_at(source_file, line_no)
name_size = name |> to_string |> String.length
skip = SourceFile.column(source_file, line_no, name) + name_size - 1
rest = String.slice(line, skip..-1)
if Regex.match?(~r/^\((\w*)\)(.)*/, rest) do
issues ++ [issue_for(issue_meta, line_no)]
else
issues
end
end
defp issue_for(issue_meta, line_no) do
format_issue issue_meta,
message: "Do not write parentheses when function receives no arguments.",
line_no: line_no
end
end